class people:
    def __init__(self,name,age):
        self.name = name
        self.__age = age
    def __sayHello(self):
        print('Hello,大家好')
    def greeting(self):
        self.__sayHello()
    def getAge(self):
        return  self.__age
xiaolan = people('小蓝', 10)
xiaolan.greeting()
print('我叫{},我今年{}岁了。'.format(xiaolan.name,xiaolan.getAge()))


"""
2
"""

class Animal:
    type = '动物'
    food = '食物'
    def eat(self):
        print('{}吃{}'.format(self.type,self.food))
class Cat(Animal):
    pass
cat = Cat()
cat.eat()
cat.type = '猫'
cat.food = '鱼'
cat.eat()